Do I need to replace the bulb, or does this come with one?

The bulb is not included — you'll use your existing halogen bulb or pick up a replacement at any auto parts store. Installation takes about a minute once you have the assembly mounted.

What fasteners do I need to install this?

This assembly uses your factory mounting points, so existing hardware stays in place. No additional fasteners required for the installation.

Will this work with my factory wiring harness?

Yes — this assembly is designed to plug directly into your stock electrical connectors. No rewiring or adapter harnesses needed.